An optical disk provided with a land region and a groove region that are formed on a substrate, the land region and groove region being used as a recording track that is the medium of the recording/playback of information signal, and a pre-pit region that is formed at the boundary part of neighboring land region and groove region and is disposed every other boundary part, the pre-pit region including specific information. Characteristically, the specific information's in neighboring pre-pit regions are not aligned in the radius direction of the optical disk.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An optical disk device for conducting the recording/playback of an optical disk comprising a land region and a groove region that are formed on a substrate, said land region and groove region being used as a recording track that is the medium of the recording/playback of information signal, and a pre-pit region including address information, comprising: a header region detection means for outputting header region signal to indicate the position of a header region including the pre-pit region from a track add signal; means for outputting first-order differential signal from a push-pull signal as a track difference signal; means for outputting differential cross signal from the zero cross signal of said first-order differential signal; a window comparator means for binarizing the amplitude of said first-order differential signal at a predetermined slice level; and a logical operation means for outputting track region detection signal to determine whether a track scanned by light beam is a land region or a groove region, from said header region signal, differential cross signal and output signal of said window comparator means.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
September 25, 2002
November 4, 2003
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